Typing your error code into google produces: http://www.pinoymac.org/forum/viewtopic.php?t=503
"when useing the jaguar hardware test cd, make sure you unplug ALL external devices FIRST!! it gave me a " ERROR CODE: 2MEM/1/4: DIMM1/J22 " error.
i started to panic!! i thought i killed one of my 512Meg DIMMs. the usb MIDI interface was the culprit"